The Supreme Court has declined to revive a lawsuit against Iran filed by Americans held hostage at the U.S. Embassy in Tehran more than 30 years ago.

The justices on Tuesday did not comment in letting stand lower court decisions dismissing the $6.6 billion class-action lawsuit.

Tho lower courts found the agreement to release the hostages, known as the Algiers Accords, precluded lawsuits against Iran. The suit argued that legislation in 2008 gave the hostages the right to sue.

Fifty-two American diplomats and military officials were held captive for more than a year at the end of Jimmy Carter’s presidency by a group of Islamist students who supported the Iranian revolution.